Communication accommodation theory forecasts that social power plays an important role in affecting communicative behaviors. Former research proposes these effects extend to linguistic style, thought to be a nonconscious aspect of communication. This paper examines if these effects hold when individuals interact employing a medium restricted in personal cues, computer-mediated communication. The paper manipulated social power in instant messaging conversations and measured subsequent interpersonal impressions. Low power induced greater likelihood of linguistic style accommodation, across between- (Study 1) and within-subjects (Study 2) experiments. Accommodation by those in a low-power role had no influence on impressions formed by their partner. In contrast, linguistic style accommodation by individuals in a high-power role was associated with negative interpersonal impressions formed by their lower power partner. The results display robust effects of power in shaping language use across computer-mediated communication. Furthermore, the interpersonal effects of linguistic accommodation rely on the conversational norms of the social context.